<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 为 ECharts 准备一个定义了宽高的 DOM -->
      <div id="main" style="width: 750px; height: 400px"></div>
    </el-card>
  </div>
</template>

<script>
import * as echarts from "echarts";
import _ from "lodash";

export default {
  name: "Report",
  data() {
    return {
      // 需要合并的数据  怎样将这个和数据库里返回的那个合并呢
      options: {
        title: {
          text: "用户来源",
        },
        tooltip: {
          trigger: "axis",
          axisPointer: {
            type: "cross",
            label: {
              backgroundColor: "#E9EEF3",
            },
          },
        },
        grid: {
          left: "3%",
          right: "4%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: [
          {
            boundaryGap: false,
          },
        ],
        yAxis: [
          {
            type: "value",
          },
        ],
      },
    };
  },
  created() {},
  async mounted() {
    //因为要在页面渲染完成之后在执行  dom元素渲染完毕
    // 基于准备好的dom，初始化echarts实例
    var myChart = echarts.init(document.getElementById("main"));

    // 先从数据库获取数据
    const { data: res } = await this.$http.get(`reports/type/1`);
    if (res.meta.status !== 200) {
      return this.$message.error("获取折线图数据失败");
    }
    this.$message.success("获取折线图数据成功");

    //   准备数据和配置项
    // 通过深复制来合并两个数据并进行展示
    const result = _.merge(res.data, this.options);

    //   展示数据  直接使用数据库数据会缺少鼠标跟随等样式
    myChart.setOption(result);
  },
  methods: {},
};
</script>
<style scoped>
</style>